[TYPO3] newloginbox redirect??

[PEF]

Hey,

I've installed newloginbox and I want to redirect to another page. 
Therefore I've installed dkd_redirect_at_login (also tried 
bzb_newloginbox_redirect) but I can't figure out, how to set the 
redirect page.

I've noticed, that the input form holds a hidden field called 
redirect_url - and it holds no value at the moment.

The redirection url has to take two extra params - the language 
parameter L and a custom parameter cid.

Can anyone please tell me, how I set the redirect parameter? I would 
appreciate a code snippet if possible.

Regards
Peter Falk